Jack



FIG. 1 is a front elevational view of the jack according to the claimed design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top, front, and right side perspective view thereof;

FIG. 8 is a top, front, and left side perspective view thereof;

FIG. 9 is a bottom, front, and left side perspective view thereof; and,

FIG. 10 is a bottom, back and right side perspective view thereof.

The broken lines are included for the purpose of illustrating—unclaimed—environmental structures and form no part of the claimed design, and the special dot-dash line defines the bounds of the claimed design and forms no part of the claimed design. 

CLAIM The ornamental design for a jack, as shown and described. 